Effect of Some Microorganisms on Controlling Fusarium Wilt of Roselle (Hibiscus sabdariffa L.)

Abstract

Roselle (Hibiscus sabdariffa L.) is one of the most crucial medicinal plants all over the world. The present study was carried out with the intention of solving some problems related to soil-borne diseases. Fusarium oxysporum is associated with wilt disease of roselle plant. The application of some microbiota i.e., a mixture of Pseudomonas fluorescens (PSR-11), Bacillus subtilis (BSR-8), Pleurotus ostreatus and mycorrhizeen® individually or in combination were investigated for controlling wilt disease, growth, and yield of roselle plant. The study was conducted in sandy textured soil under sprinkler irrigation of Ismailia Agricultural Research Station, Ismailia, Egypt. Under greenhouse conditions, all the tested bioagents reduced wilt incidence and increased the percentage of survived plants. The conglomeration of the bacterial mixture of Pseudomonas fluorescens and Bacillus subtilis, Pleurotus ostreatus and mycorrhizeen® was more effective in controlling wilt disease than using any of them individually. The application of the investigated bioagents showed a significant increase in phenol, photosynthetic pigments, and dehydrogenase contents, as well as root colonization percent. The obtained results showed the ability of B. subtilis and P. fluorescens to produce lytic enzymes such as β-1-3 glucanase, β-1-4 glucanase, chitinase and protease, in addition to their production of siderophore and HCN. The consortium of all microbiota gave the best results for growth and yield parameters of roselle plant.

Biological Control of Celery Powdery Mildew Disease Caused by Erysiphe heraclei DC In Vitro and In Vivo Conditions

“…However, S. marcescens is considered nowadays as an opportunistic pathogen for healthcare-associated infection and antimicrobial resistance [64]. On the other hand, it has been demonstrated that P. fluorescens can serve as a potential biocontrol agent due to its production of a number of secondary metabolites, such as antibiotics, lytic enzymes, i.e., β-1-3 glucanase, β-1-4 glucanase, chitinase and protease [65], siderophores and hydrogen cyanide [66]. The results also show that difenoconazole was the most efficient in reducing the disease severity and AUDPC.…”

Status of the Major Nutrients in Some Soils West of the Nile Delta, Egypt Using Gis Technique

“…Sandy and calcareous soils represent large areas in the arid and semi-arid regions, especially in the Arab world. These soils are generally characterized by low fertility levels, easy volatilization of ammonia, low water retention capacity and alkaline effect (El-Tapey et al, 2019 andGaafar et al, 2021).…”